feat: adds gemara-documentation CODEOWNERS

[hbraswelrh]

Description

This PR adds CODEOWNERS access to docs/ using the gemara-documentation GitHub team.

Schema Changes

Schema Changes Made

• No schema changes
• Audit Log schema (auditlog.cue) changes
• Capability Catalog schema (capabilitycatalog.cue) changes
• Control Catalog schema (controlcatalog.cue) changes
• Enforcement Log schema (enforcementlog.cue) changes
• Evaluation Log schema (evaluationlog.cue) changes
• Guidance Catalog schema (guidancecatalog.cue) changes
• Mapping Document schema (mappingdocument.cue) changes
• Policy Document schema (policy.cue) changes
• Principle Catalog schema (principlecatalog.cue) changes
• Risk Catalog schema (riskcatalog.cue) changes
• Threat Catalog schema (threatcatalog.cue) changes
• Vector Catalog schema (vectorcatalog.cue) changes
• Other

Schema Change Details

<!-- If applicable, provide a brief summary or example of schema changes -->

Testing

• Unit tests added/updated
• Manual testing performed
• Test data updated (if applicable)

Related Issues

Reviewer Hints

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